UBSAN: shift-out-of-bounds in filemap_get

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[syzbot] [mm?] [bcachefs?] UBSAN: shift-out-of-bounds in filemap_get_entry	2 (3)	2025/02/03 04:29

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[syzbot] [mm?] [bcachefs?] UBSAN: shift-out-of-bounds in filemap_get_entry

2 (3)

2025/02/03 04:29

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UBSAN: shift-out-of-bounds in lib/xarray.c:147:16
shift exponent 192 is too large for 64-bit type 'unsigned long'
CPU: 0 UID: 0 PID: 2666 Comm: kworker/u4:9 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: loop0 loop_rootcg_workfn
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 get_offset lib/xarray.c:147 [inline]
 xas_descend lib/xarray.c:207 [inline]
 xas_load+0x583/0x5c0 lib/xarray.c:246
 filemap_get_entry+0x1f0/0x3b0 mm/filemap.c:1860
 shmem_get_folio_gfp+0x285/0x1840 mm/shmem.c:2446
 shmem_get_folio mm/shmem.c:2628 [inline]
 shmem_write_begin+0x165/0x350 mm/shmem.c:3278
 generic_perform_write+0x346/0x990 mm/filemap.c:4189
 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3454
 do_iter_readv_writev+0x71a/0x9d0
 vfs_iter_write+0x23e/0x600 fs/read_write.c:974
 lo_write_bvec drivers/block/loop.c:245 [inline]
 lo_write_simple drivers/block/loop.c:266 [inline]
 do_req_filebacked drivers/block/loop.c:520 [inline]
 loop_handle_cmd drivers/block/loop.c:1926 [inline]
 loop_process_work+0x1429/0x21c0 drivers/block/loop.c:1961
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (5):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Assets (help?)	Manager	Title
2025/02/01 08:50	upstream	69e858e0b8b2	aa47157c	.config	console log	report	syz / log	C	[disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro]	ci-snapshot-upstream-root	UBSAN: shift-out-of-bounds in filemap_get_entry
2025/01/31 18:03	upstream	69e858e0b8b2	aa47157c	.config	console log	report	syz / log	C	[disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro]	ci-snapshot-upstream-root	UBSAN: shift-out-of-bounds in filemap_get_entry
2025/02/01 09:07	upstream	69e858e0b8b2	aa47157c	.config	console log	report	syz / log		[disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro]	ci-snapshot-upstream-root	UBSAN: shift-out-of-bounds in filemap_get_entry
2025/02/02 22:59	upstream	69e858e0b8b2	568559e4	.config	console log	report			[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	UBSAN: shift-out-of-bounds in filemap_get_entry
2025/01/29 17:52	upstream	805ba04cb7cc	d03b0c97	.config	console log	report			[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	UBSAN: shift-out-of-bounds in filemap_get_entry

Crashes (5):

Assets (help?)